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warnings: useless semantic types

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* src/symtab.h (symbol_list): Represent semantic types as structure
'semantic_type'.
* src/symlist.c (symbol_list_type_new): Allocate this structure.
(symbol_list_code_props_set): Set this semantic type's status to used if it
was not declared.
* src/symtab.c (semantic_types_sorted): New.
(semantic_type_new): Set the new semantic type's location appropriately.
(symbol_check_defined): If a symbol has a type, then set this type's status
to "declared".
(semantic_type_check_defined, semantic_type_check_defined_processor): Same
as symbol_check_defined and symbol_check_defined_processor, but for semantic
types.
(symbol_check_defined): Check semantic types usefulness.
* src/symtab.h (semantic_type): New fields 'location' and 'status'.
* src/symtab.h, src/symtab.c (semantic_type_new)
(semantic_type_from_uniqstr, semantic_type_get): Accept a location as a
supplementary argument.
* tests/input.at (Unassociated types used for printer of destructor): New.
* tests/c++.at (AT_CHECK_VARIANTS): Fix an error caught by this commit.
This commit is contained in:
Victor Santet
2012-06-18 15:44:38 +02:00
committed by Akim Demaille
parent 423ca9b50e
commit 9641b918ba
7 changed files with 105 additions and 12 deletions
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17
NEWS
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@@ -2,6 +2,23 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Warnings about useless semantic types
Bison now warns about useless (uninhabited) semantic types. Since
semantic types are not declared to Bison (they are defined in the opaque
%union structure), it is %printer/%destructor directives about useless
types that trigger the warning:
%token <type1> term
%type <type2> nterm
%printer {} <type1> <type3>
%destructor {} <type2> <type4>
%%
nterm: term { $$ = $1; };
3.28-34: warning: type <type3> is used, but is not associated to any symbol
4.28-34: warning: type <type4> is used, but is not associated to any symbol
** Warnings about undeclared symbols
Bison used to raise an error for %printer and %destructor directives for